I made a screensaver like this, where it began mainly with smaller roaming organisms and as they fed on each other they evolved into larger, more complicated entities. You can create the simpliest of AIs, but I can't imagine that it could get too intricate. Ultimately the game will be acting soley on the events you create, and I think something has to reach a certain complexity before a majority of people classify it as Artificial Intelligence.
I don't think MMF2, or even normal home computers have the computing capacity to recreate AIs that resemble the higher intelligences of primates and such; I think you're stuck recreating reptilian AIs, or basic types of that nature.